diff --git a/lib/loader.js b/lib/loader.js
index b5ec35bd..8584e66e 100644
--- a/lib/loader.js
+++ b/lib/loader.js
@@ -21,6 +21,7 @@ const asyncSassJobQueue = async.queue(sass.render, threadPoolSize - 1);
  * @param {string} content
  */
 function sassLoader(content) {
+    content = content || '//';
     const callback = this.async();
     const isSync = typeof callback !== "function";
     const self = this;